WesWorld

Rebuilding from this

Chien Kang, China Destroyer laid down 1912

Displacement:
347 t light; 358 t standard; 411 t normal; 451 t full load
Loading submergence 83 tons/feet

Dimensions:
198.00 ft x 22.00 ft x 6.00 ft (normal load)
60.35 m x 6.71 m x 1.83 m

Armament:
2 - 3.00" / 76 mm guns
2 - 1.85" / 47 mm guns
Weight of broadside 33 lbs / 15 kg
2 - 18.0" / 457.2 mm above water torpedoes

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 8,902 ihp / 6,641 Kw = 26.00 kts
Range 3,000nm at 10.00 kts
Caution: Delicate, lightweight machinery

Complement:
45 - 59

Cost:
£30.047 million / $0.190 million

Distribution of weights at normal displacement:
Armament: 4 tons, 1.0 %
Machinery: 227 tons, 55.4 %
Hull, fittings & equipment: 116 tons, 28.1 %
Fuel, ammunition & stores: 64 tons, 15.5 %
Miscellaneous weights: 0 tons, 0.0 %

Metacentric height 1.0

Remarks:
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is adequate

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.44
Shellfire needed to sink: 138 lbs / 63 Kg = 10.3 x 3.0 " / 76 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 54 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.12
Relative quality as seaboat: 1.07

Hull form characteristics:
Block coefficient: 0.550
Sharpness coefficient: 0.36
Hull speed coefficient 'M': 8.14
'Natural speed' for length: 14.07 kts
Power going to wave formation at top speed: 73 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 186.5 %
Relative accommodation and working space: 113.8 %
(Average = 100%)
Displacement factor: 34 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.50
(Structure weight / hull surface area: 21 lbs / square foot or 105 Kg / square metre)
Relative longitudinal hull strength: 1.90
(for 12.00 ft / 3.66 m average freeboard, freeboard adjustment 4.00 ft)
Relative composite hull strength: 0.57

To this

Kaivan class patrol boats

((Ex Chien Kang, China Destroyer laid down 1912 (refit 1936))

Displacement:
348 t light; 359 t standard; 411 t normal; 452 t full load

Dimensions: Length overall / water x beam x draught
198,00 ft / 198,00 ft x 22,00 ft x 6,00 ft (normal load)
60,35 m / 60,35 m x 6,71 m x 1,83 m

Armament:
2 - 2,99" / 76,0 mm guns in single mounts, 13,39lbs / 6,08kg shells, 1912 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
4 - 0,98" / 25,0 mm guns (2x2 guns), 0,48lbs / 0,22kg shells, 1912 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 29 lbs / 13 kg
Shells per gun, main battery: 150

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 8.892 ihp / 6.633 Kw = 26,00 kts
Range 3.000nm at 10,00 kts
Bunker at max displacement = 94 tons (100% coal)
Caution: Delicate, lightweight machinery

Complement:
45 - 59

Cost:
£0,047 million / $0,188 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0,9%
Machinery: 228 tons, 55,5%
Hull, fittings & equipment: 116 tons, 28,3%
Fuel, ammunition & stores: 63 tons, 15,3%
Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
137 lbs / 62 Kg = 10,2 x 3,0 " / 76 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 1,59
Metacentric height 1,1 ft / 0,3 m
Roll period: 8,7 seconds
Steadiness - As gun platform (Average = 50 %): 41 %
- Recoil effect (Restricted arc if above 1.00): 0,07
Seaboat quality (Average = 1.00): 0,67

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,550
Length to Beam Ratio: 9,00 : 1
'Natural speed' for length: 14,07 kts
Power going to wave formation at top speed: 73 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15,48 ft / 4,72 m
- Forecastle (20%): 9,85 ft / 3,00 m
- Mid (50%): 9,85 ft / 3,00 m
- Quarterdeck (15%): 9,85 ft / 3,00 m
- Stern: 9,85 ft / 3,00 m
- Average freeboard: 10,30 ft / 3,14 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 186,0%
- Above water (accommodation/working, high = better): 126,7%
Waterplane Area: 3.040 Square feet or 282 Square metres
Displacement factor (Displacement / loading): 34%
Structure weight / hull surface area: 20 lbs/sq ft or 96 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,51
- Longitudinal: 2,57
- Overall: 0,60
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Caution: Lacks seaworthiness - very limited seakeeping ability
Compose New Message Reply to Message Forward Message Download as a Text File View Printable Version Delete Message

Quoted

Originally posted by Vukovlad

Caution: Lacks seaworthiness - very limited seakeeping ability

I am reserved about this particular line...

In the Persian Gulf, the low sea-keeping should be OK. To be used as patrol boats, I assume?

It is possible to raise Steadiness to 50%. This might raise the seaboat quality to something greater than 0.7.

Their draft is the same, but average freeboard drops from 3.66 meters to 3.14 meters. That's why the seakeeping sux, going from 1.07 to 0.67.

You might be better off just to delete the torpedos and the 47mm and adding the 25mm in the original Springstyle than trying to tranfer her into SpringSharp.

Springstyle designs are perfectly legit in WesWorld.

Yes they will be Customs/Fishery protection boats, not sure if they will be part of the navy or a new organization.

How much will the refit cost? And Time?

You're just fiddling with light mounts and extending her service life.

I don´t have springstyle, Parador was kind enough to sim the rebuild.

http://ourworld.compuserve.com/homepages…se/software.htm

It also has Big Gun, a simulation of naval guns.

Thanks

Since i don´t know the original BC I can´t get the right deplacement. Would anyone mind if I kept all the original data and just made the armament mods?

for a 25% refit. You're making changes to light armament, and refurbishing her to extend her service life.

You're not reshaping her hull, or reboilering her to convert from coal firing to oil, or changing from VTE to turbines. those would be a 50% to 75% reconstruction.

And her original BC is 0.55, according to the original Springstyle.

Kavin Patrol Boat, laid down 1936

Length, 60.3 m x Beam, 6.7 m x Depth, 1.8 m
411 tonnes normal displacement (389 tonnes standard)

Main battery: 2 x 0.8-cm
AA battery: 4 x 0.2-cm

Weight of broadside: 0 kg

Hull unarmored

Maximum speed for 6641 shaft kw = 25.99 knots
Approximate cruising radius, 3000 nm / 10 knots

Typical complement: 46-59


Estimated cost, $902,000 (£226,000)

Remarks:

Caution: Hull structure is subject to strain in open-sea
conditions.

Magazines and engineering spaces are cramped, with poor
watertight subdivision.

Roomy upper decks; superior accommodation and working space.


Distribution of weights:
Percent
normal
displacement:

Machinery ........................ 210 tonnes = 51 pct
Hull and fittings; equipment ..... 170 tonnes = 41 pct
Fuel, ammunition, stores ......... 30 tonnes = 7 pct
Miscellaneous weights ............ 0 tonnes = 0 pct
-----
411 tonnes = 100 pct

Estimated metacentric height, 0.2 m

Displacement summary:

Light ship: 381 tonnes
Standard displacement: 389 tonnes
Normal service: 411 tonnes
Full load: 427 tonnes

Loading submergence 274 tonnes/metre

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.18

Shellfire needed to sink: 114 kg = 18674.8 x 0.8-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.2
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 55 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.00

Relative quality as a seaboat: 1.01

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.55
Sharpness coefficient: 0.36
Hull speed coefficient 'M' = 8.13
'Natural speed' for length = 14.1 knots
Power going to wave formation
at top speed: 73 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 165 percent

Relative accommodation and working space: 146 percent


Displacement factor: 82 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.78
(Structure weight per square
metre of hull surface: 155 kg)

Relative longitudinal hull strength: 2.92
(for 3.66 m average freeboard;
freeboard adjustment +1.22 m)

Relative composite hull strength: 0.89

+++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

197.95 x 22.01 x 6.00; 12.00 -- Dimensions
0.55 -- Block coefficient
1936 -- Year laid down
25.99 / 3000 / 10.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
0 tons -- Miscellaneous weights
++++++++++
2 x 0.30; 0 -- Main battery; turrets
Central positioning of guns
:
0 -- No secondary battery
4 x 0.10 -- Tertiary (QF/AA) battery
:
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.00 -- No battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Acceptable?